Chapsa inconspicua

The lichen forms a crust-like body (thallus) on bark, up to 5 cm (2 in) across and about 20–30 μm thick. The surface is whitish and smooth to uneven; no visible border zone (prothallus) was observed. In cross-section, the thallus lacks an outer skin (cortex) and has a scattered algal layer embedded within the bark tissue (periderm). The algal partner (photobiont) is from the green algal genus Trentepohlia.^[2]

The fruiting bodies (ascomata) partly protrude from the thallus (erumpent) and are of the chroodiscoid type (with a broad, exposed disc surrounded by lobed thallus tissue), about 0.5–1 mm long and 0.15–0.2 mm high. The disc is exposed and flesh-colored, with a thin white frosting (pruina). The inner fungal rim (proper margin) is indistinct, while the outer thallus-derived rim (thalline margin) curves outward and is divided into 4–7 triangular to irregular lobelets (lobules).^[2]

The species is known from the type locality in Colombia, in Caquetá Department (Araracuara area), where it was collected at about 300 m (980 ft) elevation in secondary vegetation and gardens, growing on the bark of a small tree.^[2]